package socket;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

/**
 * 聊天室的服务器 版本4
 *
 */
public class Server服务器端4 {
    private ServerSocket serverSocket;

    //V4:该集合用于保存所有客户端的输出流，用于广播消息
    private List<PrintWriter> allout = new ArrayList<>();


    public Server服务器端4(){
        try {
            System.out.println("正在启动服务端");
            serverSocket = new ServerSocket(8848);
            System.out.println("服务端启动完毕");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start(){
        try {
            while(true){
                System.out.println("等待客户端链接");
                Socket socket = serverSocket.accept();
                System.out.println("一个客户端链接成功");
                //启动一个线程负责与该客户交互
                ClientHandler handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server服务器端4 server = new Server服务器端4();
        server.start();
    }

    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;//记录该客户端的IP地址

        public ClientHandler(Socket socket) {
            this.socket = socket;
            //通过socket远端计算机的IP地址的字符串格式
            this.host = socket.getInetAddress().getHostAddress();
        }

        public void run(){
            try {
                InputStream in  = socket.getInputStream();//低级流
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                //PrintWriter pw = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream(),StandardCharsets.UTF_8)),true);
                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out,StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                PrintWriter pw = new PrintWriter(bw,true);

                //V4:将对应该客户端的输出流存入到共享集合allOut中，便于其他线程可以访问到
                allout.add(pw);


                String message;
                while((message=br.readLine())!=null) {
                    System.out.println(host+"说:"+message);
                    //V4:遍历allOut集合，给所有客户端发送这个消息
                    for(PrintWriter o : allout){
                        o.println(host+"说:"+message);
                    }
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}

